UnicornZ ER-151 Water Resistant Anti-scratch Dustproof Shockproof Multimedia ... Good sound quality A2DP stereo Bluetooth transmission Easy to use and the output power also not bad. Water resistant, dustproof, anti-scratch, shockproof, suitable for both indoor and outdoor exercise Aux in function support all digital audio device with 3.5mm jack, such as iPod/iPhone, MP3, computer, notebook, PSP